All demos fail due to 404 for cellsjs

[adamlwgriffiths]

www.celljs.org/cell.js has been re/moved.

[adamlwgriffiths]

I've managed to find a CDN cache with cells.js:
https://www.tutorialjinni.com/cell-cdn-link.html

Specifically:
https://cdn.tutorialjinni.com/cell/1.2.0/cell.js
https://cdn.tutorialjinni.com/cell/1.2.0/cell.min.js